package com.example.ruiji.filter;

import com.alibaba.fastjson.JSON;
import com.example.ruiji.common.BaseContext;
import com.example.ruiji.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;



@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //获取本次请求的url
        String requestURL = request.getRequestURI();
        log.info("拦截到的请求{}",requestURL);
        //定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**"
        };
        //判断本次请求是否需要处理
        boolean check = check(urls, requestURL);
        //不需要处理直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURL);
            filterChain.doFilter(request,response);
            return;
        }
        //判断登入状态,已经登入
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登入，用户id为{}",request.getSession().getAttribute("employee"));
           Long empId =  (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登入");
        //未登入,通过输出流
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }
    public boolean check(String[] urls,String requestURL){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURL);
            if (match){
                return true;
            }
        }
        return false;
    }
}
